Methods for preparing cubic boron nitride sintered body and cubi

Chemistry of inorganic compounds – Boron or compound thereof – Binary compound

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501 96, C01B 2106

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045459681

ABSTRACT:
There are disclosed methods for preparing cubic boron nitride sintered body. One method involves pyrolyzing borazine and/or a borazine derivative to obtain a boron nitride; mixing said boron nitride and a catalyst composed of a metal and/or metallic compound; and reacting the mixture at a pressure of 3 GPa or more and at a temperature of 700.degree. C. or more. Another method comprises the step of pyrolyzing borazine and/or a borazine derivative to obtain a boron nitride; mixing said boron nitride and a catalyst composed of a metal and/or metallic compound; reacting the mixture at a pressure of 3 GPa or more and at a temperature of 700.degree. C. or more; and removing the catalyst from a formed product. The conversion rate into cubic boron nitride achieved with these methods is as high as 100%, and the obtained cubic boron nitride is highly pure and fine. Also disclosed is a method for preparing boron nitride by pyrolyzing at least one compound selected from the group consisting of borazine and/or a borazine derivative at a temperature of 150.degree. to 700.degree. C. and a pressure of 10 MPa or more.

REFERENCES:
patent: 4150097 (1979-04-01), Hough et al.
patent: 4157927 (1979-06-01), Chew et al.
H. Sumiya et al., "High Pressure Synthesis of Cubic Boron Nitride from Amorphous State" Mat. Res. Bull., vol. 18, pp. 1203-1207, (1983).
Copy of Funtai Funmatsu Yakin Kyokai, Outline Booklet at Spring Congress Lecture, pp. 96 to 97, 1983.

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